Prefabricated foundation pile capable of reducing negative friction

Abstract

The present invention relates to a prefabricated foundation pile body capable of reducing negative frictional resistance, and the device solves the problem of limited reduction of negative frictional resistance of existing pile bodies, comprising a soil layer, a placement hole provided inside the soil layer, a pile body installed in cooperation with the soil layer, a protective tube installed in cooperation with the side wall of the pile body, and a telescopic rod rotatably installed on the side wall of the protective tube, a first spring fixedly installed on the bottom wall and the top wall of the telescopic rod, and a fixed plate slidably installed on the side wall of the protective tube on the side of the telescopic rod away from the protective tube, a right-angle plate slidably installed between two adjacent fixed plates, and a telescopic groove plate fixedly installed on the bottom of the placement hole; when the protective tube is installed, the fixed plate squeezes the surrounding soil layer to make it squeezed, thereby improving the sealing of the soil around the pile and preventing the soil around the pile from settling, and the protective tube is squeezed by the telescopic rod to cooperate with the foundation to reduce the load on the pile body, and when the soil around the pile settles, the sliding plate cooperates with the air inside the telescopic plate to convert the settlement force into an upward force for the pile body and the foundation, thereby effectively reducing the negative frictional resistance.

Description

Technical Field

[0001] The invention relates to the technical field of reducing the negative friction resistance of prefabricated piles, and in particular to a prefabricated foundation pile body capable of reducing the negative friction resistance. Background Art

[0002] The construction of the project will come into contact with many areas with poor soil quality, such as new fill layers, underconsolidated soil layers, deep soft soil layers and other poor soils. The poor soil will cause settlement and generate negative friction on the pile body. The negative friction increases the vertical load of the pile body. If time continues to increase, the load on the pile body will increase the settlement of the pile foundation and affect the safety of the upper structure. In the existing technology, most of the asphalt coating method and the casing method are used. The above methods can only reduce the negative friction, and the asphalt coating will be affected by temperature and time. The casing method has a higher implementation process for the pile foundation, and will still generate a certain amount of negative friction on the pile body through the casing.

[0003] In view of the above, we provide a prefabricated foundation pile body that can reduce negative friction to solve the above problems. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a prefabricated foundation pile body that can reduce negative frictional resistance. The device is provided by setting a protective tube and a fixed plate in conjunction with a telescopic rod. When the protective tube is installed, the fixed plate squeezes the surrounding soil layer to make it squeezed, thereby improving the sealing of the soil around the pile and preventing the soil around the pile from settling. At the same time, the telescopic rod squeezes the protective tube to cooperate with the pedestal to reduce the load on the pile body. When the soil around the pile settles, the sliding plate cooperates with the air inside the telescopic plate to convert the settlement force into an upward force for the pile body and the pedestal, thereby effectively reducing the negative frictional resistance.

[0005] A prefabricated foundation pile body that can reduce negative frictional resistance includes a soil layer, characterized in that a placement hole is opened inside the soil layer and a pile body is installed in cooperation with the soil layer, a protective tube is installed in cooperation with the side wall of the pile body, and a telescopic rod is rotatably installed on the side wall of the protective tube, a first spring is fixedly installed on the bottom wall and the top wall of the telescopic rod, and a fixed plate slidably installed on the side wall of the protective tube is rotatably installed on the side of the telescopic rod away from the protective tube, a right-angle plate is slidably installed between two adjacent fixed plates, and a driving rack is fixedly installed on both side walls of the right-angle plate, a first slot hole that cooperates with the driving rack is opened inside the fixed plate, and a driving gear is rotatably installed inside the first slot hole, a telescopic slot plate is fixedly installed on the bottom of the placement hole, and a sliding device is installed in cooperation with the side wall of the fixed plate.

[0006] Preferably, the sliding device includes a plurality of sliding plates slidably mounted on the side walls of the fixed plate and a telescopic plate fixedly mounted on the side walls of the fixed plate is provided at the bottom of the sliding plate, an air storage box is fixedly mounted on the surface of the protective tube and the air storage box is connected to the interior of the telescopic plate through pipes, a second slot hole is provided inside the telescopic rod and a first top block is slidably mounted inside the second slot hole, the side wall of the first top block is fixedly connected to the first spring, and the second slot hole is connected to the air storage box through a pipe.

[0007] Preferably, a first telescopic cylinder is fixedly mounted on the side wall of the protective cylinder, and the other side of the first telescopic cylinder is slidably mounted on the side wall of the fixed plate.

[0008] Preferably, the sliding plate is an L-shaped plate.

[0009] Preferably, a cap is fixedly mounted on the top of the pile body and the protective tube, and the cap fixes the pile body and the protective tube into one.

[0010] Preferably, the soil layer includes an underconsolidated soil layer and a bearing soil layer.

[0011] Preferably, a pile tip is fixedly mounted on the bottom of the pile body.

[0012] Preferably, the telescopic slot plate includes an upper telescopic plate and a lower telescopic plate, and a pressure valve is provided inside the upper telescopic plate.

[0013] The beneficial effects of the above technical solution are:

[0014] (1) The protective tube and the fixed plate cooperate with the telescopic rod to squeeze the fixed plate around the placement hole and fix it with the sliding plate. The soil around the pile is squeezed and its density increases, which can prevent settlement. At the same time, through the installation of the protective tube, the fixed plate is squeezed inside the soil layer, and the telescopic rod is squeezed, so that the protective tube is subjected to an upward force, thereby reducing the load on the pile body;

[0015] (2) The protective tube squeezes the expansion slot plate, causing the fixed plate to separate from the upper portion of the expansion slot plate. When the soil settles, the negative frictional resistance can be reduced by driving the fixed plate downward. At the same time, the fixed plate and the expansion rod are synchronously moved and expanded through the right-angle plate to ensure that the protective tube and the pile body are evenly stressed, preventing one side of the pile body from being stressed more and the other side from being stressed less, which affects the pile body load.

[0016] (3) By moving the fixed plate downward and approaching the protective tube, the problem of negative friction acting on the pile body is effectively reduced. At the same time, when the fixed plate approaches the protective tube and squeezes the telescopic rod, in order to prevent the fixed plate from falling under the negative friction and drive the telescopic slot plate to fall, the upward force of the telescopic rod on the protective tube is reduced. Moreover, under the action of the fixed plate, the telescopic slot plate will produce downward friction on the pile body, increasing the internal load of the pile body. At this time, the settled soil layer can drive the sliding plate to slide, thereby reducing the squeezing of the settled soil layer on the fixed plate and the negative friction. The sliding plate slides and squeezes the telescopic plate, so that the internal air enters the air storage box and passes into the second slot hole through the air storage box, so that the first top block touches the first spring, thereby converting the negative friction into a force for the protective tube and the pile body to move upward. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the placement hole of the present invention;

[0019] Figure 3 This is a schematic diagram of the pile structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the enlarged structure of part A of the present invention;

[0021] Figure 5 This is a schematic diagram of the fixed plate structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the protective tube structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the sliding plate structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the driving gear structure of the present invention;

[0025] Figure 9 This is a schematic diagram of the internal structure of the telescopic rod of the present invention;

[0026] Figure 10 This is a schematic diagram of the right-angle plate structure of the present invention.

[0027] 1. Soil layer; 2. Placement hole; 3. Pile body; 4. Protective tube; 5. Telescopic rod; 6. First spring; 7. Fixed plate; 8. Right-angle plate; 9. Drive rack; 10. First slot; 11. Drive gear; 12. Telescopic slot plate; 13. Sliding plate; 14. Telescopic plate; 15. Air tank; 16. Second slot; 17. First top block; 18. First telescopic tube; 19. Underconsolidated soil layer; 20. Bearing soil layer; 21. Pile tip; 22. Upper telescopic plate; 23. Lower telescopic plate; 24. Capping platform; DETAILED DESCRIPTION

[0028] The above and other technical contents, features and effects of the present invention are described below with reference to the attached Figure 1 To the attached Figure 10 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the accompanying drawings.

[0029] Various exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] This embodiment provides a prefabricated foundation pile body that can reduce negative friction resistance. Figure 2 and attached Figure 3 As shown, it includes a soil layer 1, which includes an underconsolidated soil layer 19 and a bearing soil layer 20. A placement hole 2 is opened inside the soil layer 1 and a pile body 3 is installed inside the soil layer 1. The bottom of the placement hole 2 is opened below the neutral point, that is, the position of the bearing soil layer 20. A pile tip 21 is fixedly installed at the bottom of the pile body 3. The pile tip 21 facilitates the pile body 3 to sink into the bearing soil layer 20 during hammering or static pressure. A protective tube 4 is installed on the side wall of the pile body 3 and a telescopic rod 5 is rotatably installed on the side wall of the protective tube 4. The pile body 3 and the protective tube 4 are both square and the protective tube 4 contacts and slides with the pile body 3. A first spring 6 is fixedly installed on the bottom wall and the top wall of the telescopic rod 5 and a fixed plate 7 slidably installed on the side wall of the protective tube 4 is rotatably installed on the side wall of the protective tube 4 of the telescopic rod 5. A first telescopic tube 18 is fixedly installed on the side wall of the protective tube 4 and the other side of the first telescopic tube 18 is slidably installed on the side wall of the fixed plate 7. The purpose of the first telescopic tube 18 is to make The fixed plate 7 slides up and down to prevent the fixed plate 7 from tilting. A right-angle plate 8 is slidably installed between two adjacent fixed plates 7, and a driving rack 9 is fixedly installed on both side walls of the right-angle plate 8. A first slot hole 10 that cooperates with the driving rack 9 is opened inside the fixed plate 7, and a driving gear 11 is rotatably installed inside the first slot hole 10. A telescopic slot plate 12 is fixedly installed at the bottom of the placement hole 2, and a sliding device is installed on the side wall of the fixed plate 7. In order to further reduce the negative friction resistance and utilize the settlement of the soil layer 1 to increase the elastic force of the first spring 6 inside the telescopic rod 5, the sliding device is fixedly installed with a pedestal 24 on the top of the pile body 3 and the protective tube 4, and the pedestal 24 fixes the pile body 3 and the protective tube 4 as one. The pedestal 24 is cast by concrete, and the upper part of the pedestal 24 can be used for construction. The top wall of the pile body 3 is horizontal with the top wall of the protective tube 4. The telescopic slot plate 12 includes an upper telescopic plate 22 and a lower telescopic plate 23, and a pressure valve is provided inside the upper telescopic plate 22.

[0031] In the initial state, the telescopic slot plate 12 is in the extended state, the driving racks 9 on both sides of the right-angle plate 8 respectively engage with the upper and lower parts of the driving gears 11 inside different fixed plates 7, and the telescopic rod 5 is in the extended state under the gravity of the fixed plate 7. The first spring 6 is in the normal state, and the fixed plate 7 slides along the side wall of the first telescopic cylinder 18 and drives the first telescopic cylinder 18 to extend and retract;

[0032] During operation, the pile body 3 and the pile tip 21 are manually placed into the placement hole 2, and the pile body 3 is driven into the bearing soil layer 20 by hammering or static pressure, and the verticality of the pile body 3 is ensured. Then, the telescopic slot plate 12 is manually placed at the bottom of the placement hole 2, and the inner wall of the telescopic slot plate 12 slides with the side wall of the pile body 3. At the same time, the telescopic slot plate 12 is in the position of the bearing soil layer 20, which improves the stability of the telescopic slot plate 12 and prevents the telescopic slot plate 12 from falling as the underconsolidated soil layer 19 settles. Then, the protective tube 4 is manually placed into the placement hole 2 in conjunction with the side wall of the pile body 3. At this time, the fixed plate 7 is close to the side wall of the protective tube 4 and the bottom wall of the fixed plate 7 under the action of gravity. The telescopic rod 5 is lower than the bottom wall of the fixed plate 7, and the telescopic rod 5 is in an inclined state. As the protective tube 4 slides down along the side wall of the state, the four fixed plates 7 move down synchronously under the action of the right-angle plate 8. The bottom wall of the fixed plate 7 first contacts the upper telescopic plate 22 of the telescopic slot plate 12. The protective tube 4 continues to slide down with manual hammering or static pressure. The protective tube 4 squeezes the telescopic rod 5 and the first spring 6 inside the telescopic rod 5 to make the fixed plate 7 slide away from the protective tube 4. At this time, the internal pressure of the telescopic slot plate 12 is not enough to reach the pressure value of the pressure valve, and the telescopic slot plate 12 does not shrink until the bottom wall of the protective tube 4 contacts the top wall of the telescopic slot plate 12. At this time, the fixed plate 7 is squeezed on the place The soil layer 1 on the side wall of the hole 2 is fixed in the soil layer 1 on the side wall of the placement hole 2 by a sliding device, and the fixed plate 7 squeezes the soil layer 1 on the side wall of the placement hole 2, so that the density of the soil layer 1 on the side wall of the placement hole 2 is increased, and the soil layer 1 on the side wall of the placement hole 2 is further fixed by the sliding device, which can prevent the settlement of the soil layer 1 around the placement hole 2. At this time, the machine is manually controlled to continue hammering or statically pressurizing the protective tube 4 so that the protective tube 4 squeezes the telescopic slot plate 12. Under the action of the machine, the internal pressure of the telescopic slot plate 12 reaches the maximum and is greater than the pressure value of the pressure valve. At this time, the protective tube 4 squeezes the telescopic slot plate 12 to slide down, causing the telescopic slot plate 12 to shrink, and the air inside the telescopic slot plate 12 is vented. The overpressure valve is discharged, and the protective tube 4 slides down until the top wall of the protective tube 4 is in the same plane as the top wall of the pile body 3. At this time, due to the squeezing of the fixing plate 7 and the side wall of the placement hole 2 and the fixation of the sliding device to the side wall of the placement hole 2, the fixing plate 7 will not move downward, and the bottom wall of the protective tube 4 is lower than the bottom wall of the fixing plate 7. At the same time, the protective tube 4 further squeezes the telescopic rod 5, causing the first spring 6 to contract. The telescopic rod 5 is still in an inclined state. At this time, the base 24 cast by concrete fixes the protective tube 4 to the pile body 3. Under the action of the first spring 6 inside the telescopic rod 5, the telescopic rod 5 exerts an upward force on the protective tube 4, thereby reducing the load on the pile body 3.

[0033] When the soil layer 1 around the placement hole 2 settles, the surrounding soil layer 1 exerts a downward negative friction force on the fixed plate 7, which can be decomposed into a force downward and toward the protective tube 4. At this time, the settlement of the surrounding soil layer 1 squeezes the fixed plate 7 to move toward the protective tube 4 and causes the fixed plate 7 to drop. Due to the contraction of the telescopic slot plate 12, the fixed plate 7 moves downward under the action of the surrounding soil layer 1. At this time, the telescopic rod 5 is stretched, and the internal first spring 6 is expanded a certain distance. The upward force of the first spring 6 on the protective tube 4 is reduced. At the same time, under the action of the right-angle plate 8, the fixed plates 7 on all sides drop synchronously to prevent the telescopic rod 5 and the first spring 6 on one side of the protective tube 4 from exerting less force on the protective tube 4 than the force on the other side, so that the two sides of the protective tube 4 are unevenly stressed. The protective tube 4 is subjected to force inside the pile body 3, which has an impact on the pile body 3; and after moving downward, under the action of the settled soil layer 1, after the bottom wall of the fixed plate 7 contacts the upper wall of the telescopic slot plate 12, it will also slide toward the direction close to the protective tube 4, increasing the force of the telescopic rod 5 on the protective tube 4, and the right-angle plate 8 slides inside the fixed plate 7 as the fixed plate 7 slides. At the same time, the right-angle plate 8 drives the rack 9 and the gear 11 to make the fixed plate 7 on the opposite side move synchronously, and at the same time ensure that the protective tube 4 is subjected to the same force of the telescopic rod 5. Through the downward movement and sliding of the fixed plate 7, the negative friction resistance of the settled soil layer 1 on the pile body 3 can be effectively reduced. At the same time, the telescopic rod 5 is driven to contract through the settlement of the soil layer 1, so that the pile body 3 reduces the load of the top building.

[0034] The sliding device includes a plurality of sliding plates 13 slidably mounted on the side walls of the fixed plate 7 and a telescopic plate 14 fixedly mounted on the side walls of the fixed plate 7 is provided at the bottom of the sliding plate 13. A fixed spring can be provided inside the telescopic plate 14 to prevent the sliding plate 13 from sliding when the surrounding soil layer 1 sinks. The interior of the telescopic plate 14 is a cavity filled with air. The sliding plate 13 is an L-shaped plate. The sliding plate 13 facilitates the fixing plate 7 to fix the soil layer 1 on the side wall of the placement hole 2, and when the soil layer 1 sinks, it is convenient for the soil layer 1 to drive the sliding plate 13 slides, an air storage box 15 is fixedly installed on the surface of the protective cylinder 4, and the air storage box 15 is connected to the inside of the telescopic plate 14 through a pipe, a one-way valve is set inside the pipe between the telescopic plate 14 and the air storage box 15, a second slot 16 is opened inside the telescopic rod 5, and a first top block 17 is slidably installed inside the second slot 16, the side wall of the first top block 17 is fixedly connected to the first spring 6, the second slot 16 is connected to the air storage box 15 through a pipe, and a one-way valve is set inside the channel where the second slot 16 is connected to the air storage box 15;

[0035] When the soil layer 1 around the placement hole 2 settles, the fixed plate 7 descends under the negative friction resistance and drives the telescopic slot plate 12 to descend, reducing the upward force of the telescopic rod 5 on the protective tube 4. Moreover, the telescopic slot plate 12 will produce downward friction on the pile body 3 under the action of the fixed plate 7, increasing the internal load of the pile body 3. At this time, the sliding plate 13 can be squeezed by the settling soil layer 1, so that the sliding plate 13 slides on the side wall of the fixed plate 7, thereby reducing the negative friction resistance of the settling soil layer 1 on the fixed plate 7 and preventing the fixed plate 7 from sinking. At the same time, the settling soil layer 1 drives the sliding plate 13 to slide, and the sliding plate 13 squeezes the telescopic plate 14, so that the air inside the telescopic plate 14 enters the air storage box 15, and then the air is filled into the second slot hole 16 through the air storage box 15 and the pipeline, so that the first top block 17 squeezes the first spring 6, thereby increasing the force of the first spring 6 on the protective tube 4 to move upward, and fully utilizing the settlement of the soil layer 1 to convert it into a force to reduce the load of the protective tube 4 and the pile body 3.

[0036] The above is only for illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various variations that conform to the concept of the present invention are within the scope of protection of the present invention.

Claims

1. A prefabricated foundation pile body capable of reducing negative frictional resistance, comprising a soil layer (1), characterized in that: A placement hole (2) is provided inside the soil layer (1) and a pile body (3) is installed in cooperation with the soil layer (1). A protective tube (4) is installed in cooperation with the side wall of the pile body (3), and a telescopic rod (5) is rotatably installed on the side wall of the protective tube (4). A first spring (6) is fixedly installed on the bottom wall and the top wall of the telescopic rod (5), and a fixed plate (7) slidably installed on the side wall of the protective tube (4) is rotatably installed on the side of the telescopic rod (5) away from the protective tube (4). A right-angle plate (8) is slidably installed between two adjacent fixed plates (7), and a driving rack (9) is fixedly installed on both side walls of the right-angle plate (8). A first slotted hole (10) cooperating with the driving rack (9) is provided inside the fixed plate (7), and a driving gear (11) is rotatably installed inside the first slotted hole (10). A telescopic slotted plate (12) is fixedly installed on the bottom of the placement hole (2), and a sliding device is rotatably installed on the side wall of the fixed plate (7). The sliding device comprises a plurality of sliding plates (13) slidably mounted on the side wall of the fixed plate (7), and a telescopic plate (14) fixedly mounted on the side wall of the fixed plate (7) is provided at the bottom of the sliding plate (13); an air storage box (15) is fixedly mounted on the surface of the protective tube (4), and the air storage box (15) is connected to the inside of the telescopic plate (14) through a pipeline; a second slot hole (16) is provided inside the telescopic rod (5), and a first top block (17) is slidably mounted inside the second slot hole (16); the side wall of the first top block (17) is fixedly connected to the first spring (6), and the second slot hole (16) is communicated with the air storage box (15) through a pipeline.

2. A prefabricated foundation pile capable of reducing negative friction according to claim 1, characterized in that: A first telescopic cylinder (18) is fixedly mounted on the side wall of the protective cylinder (4), and the other side of the first telescopic cylinder (18) is slidably mounted on the side wall of the fixed plate (7).

3. The prefabricated foundation pile capable of reducing negative friction according to claim 1, characterized in that: The sliding plate (13) is an L-shaped plate.

4. The prefabricated foundation pile capable of reducing negative friction according to claim 1, characterized in that: A support platform (24) is fixedly installed on the top of the pile body (3) and the protective tube (4), and the support platform (24) fixes the pile body (3) and the protective tube (4) into one body.

5. The prefabricated foundation pile capable of reducing negative friction according to claim 1, characterized in that: The soil layer (1) comprises an underconsolidated soil layer (19) and a bearing soil layer (20).

6. The prefabricated foundation pile capable of reducing negative friction according to claim 1, characterized in that: A pile tip (21) is fixedly mounted on the bottom of the pile body (3).

7. The prefabricated foundation pile capable of reducing negative friction according to claim 1, characterized in that: The telescopic slot plate (12) comprises an upper telescopic plate (22) and a lower telescopic plate (23), and a pressure valve is provided inside the upper telescopic plate (22).

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